Web-feeding mechanism for platen printing press



y 7, 1955 E. G. OLIPHANT 2,708,575

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 9Shets-Sheet 1 FIG. .1

May 17, 1955 E. G. OLIPHANT 2,708,575

WEBFEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 9Sheets-Sheet 2 A TTO ENE V.

May 17, 1955 E. G. OLIPHANT 8,

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 9Sheets-Sheet 3 IN V EN TOR.

ATTORNEY.

9 Sheets-Sheet 4 Imv E. G. OLIPHANT MECHANISM FOR PLATEN PRINTING PRESSINVENTOR. [aw/1v 6, OL/P/MNT rro ENE v.

WEB-FEEDING May 17, 1955 Filed Nov. 17, 1950 y 7, 1955 E. G. OLIPHANT2,708,575

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 9SheetQ-Sheet 5 $1; I I m m N I g m *9 V Y "9 m I OL/PHA/Vr H TTOR/VE V.

May 17, 1955 E. e. OLIPHANT WEB-FEEDING MECHANISM FOR PL Filed NOV. 17,1950 FIG. 5

ATEN PRINTING PRES 9 sheets-Sheet 6 l 4 f5. Wu. m 63 INVENTOR. \59 65 60DW/A/ OL/PHflA/T y 7, 1955 E. s. OLIPHANT 2,708,575

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed NOV. 17, 1950 9Sheets-Sheet '7 INVENTOR. Emvnv 6. OL/PHA'NT HTTORNEV.

y 17, 1955 E. G. OLIPHANT 2,708,575

WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS Filed Nov. 17, 1950 esheets-sheet s FIE. 1E

, INVENTOR. Bow/1v G. OL/PHANT HTTORNEV.

May 17, 1955 E. G. OLIPHANT MECHANISM FOR PLATEN PRINTING PRESSWEB-FEEDING 9 Snets-Sheet 9 lllllllL JNVENTOR Filed Nov. 17, 1950 EDWIN6 BY 2 A rToR/vEv WEB-FEEDING MECHANISM FOR PLATEN PRINTING PRESS EdwinG. Oliphant, Seattle, Wash. Application November'17, 1950, Serial No.196,251

4 Claims. (Cl. 271-2.6)

This invention relates to paper-feeding apparatus, and particularlyapparatus for feeding web stock through a platen-type printing press.

The general object of the invention is to devise a perfected machine forthis purpose and one, more especially,

which will intermittently move successive sections of the web into andout of printing position below the reciprocally movable platen; whichadmits of being easily and quickly set to cause the successive feedactions to uniformly advance the paper any desired distance within thelimits of a given range of adjustment; and which in each of a successionof over-printing runs of the press, insures exact registration betweenthe reciprocally moving platen and the sections of the paper web whichare to take a printing impression therefrom.

With the above and other more particular objects and advantages in viewwhich will appear and be understood in the following description andclaims, the invention consists in the novel construction and in theadaptation and combination of parts hereinafter described and claimed.

In the accompanying drawings:

Figure l is a side elevational view illustrating a machine produced inaccordance with the preferred teachings of the present invention, shownattached to a conventional platen printing press.

Fig. 2 is a top plan view thereof.

Fig. 3 is a fragmentary side elevation drawn to an enlarged scale andviewed from the side opposite that of Fig. l with the platen press beingdeleted.

Fig. 4 is a fragmentary transverse vertical section drawn to an enlargedscale on line 44 of Fig. 3.

Fig. 5 is a fragmentary front elevation drawn to a scale somewhatsmaller than the scale of Fig. 4 but larger than that of Fig. 3.

Fig. 6 is a fragmentary longitudinal vertical section on line 6-6 ofFig. 5.

Fig. 7 is an enlarged fragmentary transverse vertical section on line 77of Fig. 1.

Fig. 8 is a fragmentary longitudinal vertical section on line 8-8 ofFig. 7.

Fig. 9 is an enlarged fragmentary longitudinal vertical section on line99 of Fig. 1.

Fig. 10 is a fragmentary longitudinal vertical section drawn to anenlarged scale on line 1010 of Fig. 2 to detail a paper-drying devicewhich is incorporated in the machine.

Fig. 11 is a fragmentary perspective view detailing a feature, lookingto ease of assembly, engineered into said dryer.

Fig. 12 is a longitudinal vertical section on line 1'212 of Fig. 7.

Fig. 13 is a fragmentary longitudinal vertical section drawn to anenlarged scale on line 1313 of Fig. 2.

Fig. 14 is a somewhat schematic perspective view illustrating theworking of an electric eye which augments the primary feed to serve acorrective function in the feeding of the paper web.

States Patent 0 Fig. 15 is an enlarged fragmentary side elevational viewshowing a perfected means for holding the supply roll of paper, modifiedfrom the more conventional type of reel which I have portrayed in Fig.1.

Fig. 16 is a fragmentary plan view of a rear end portion of saidroll-carrying means.

Fig. 17 is a fragmentary transverse vertical sectional view drawn to anenlarged scale on line 1717 of Fig. 15.

Fig. 18 is a fragmentary transverse vertical section on 0 line 18-18 ofFig. 15; and

Fig. 19 is an enlarged fragmentary view detailing a part of the journalstructure shown in Fig. 18.

In said drawings the numeral 20 designates the framework of a standardplaten printing press having the usual type-carrying beam 21 pivoted, asat 22, for reciprocal swinging movement toward and from a stationarybedplate 23, the arrangement being one in which the paper to be printedis interruptedly drawn from a roll 24 and passes over the face of thebed-plate, so as to periodically come to rest upon the lattermomentarily in advanceof the timed cyclic movement of the type intopressing engagement therewith. The type-carrying beam also carriessuitable inking mechanism usually consisting of ink-transfer rollers 25movably mounted so as to ink the type from an impregnated plate 26serving as a source of supply. To give reciprocatory swing movement tothe beam and coincidently provide necessary movement for the inkingrollers it is customary to employ companion pitman arms 27 driven bycrank pins 28 off driven wheels, and with one of these wheels,designated by 30, being a gear wheel turned by an intermeshing pinion 31keyed or otherwise made fast to a drive shaft 32 which commonly carriesa fly-wheel 33 and is belt-driven by an electric motor (not shown). Withthis type of printing press, the reel or spool from which the paper isdrawn commonly turns about or with a spindle 34 supported in the mannershown in Figs. 1 and 2, and namely in open journals of a spool-carrier3.5 surmounting the framework 20. The web of paper being fed to thebed-plate is passed from this roll first under an idler 36 and thenceover an idler 37. In interruptedly drawing paper from a roll to feedsuccessive sections of the web into printing position upon thebed-plate, there is an objection to the use of a freeturning roll, andthat is the tendency of the roll, by reason of inertia, to continue tounwind during periods when the feed mechanism is inactive, and namelywhen the paper web has. been localized for printing. One feature of thepresent invention, while of secondary importance to my feed structureproper, is the provision of a perfected mount for the paper roll, outwith this exception the parts hereinbefore described are well known inthe printing art and are or may be of usual or suitable construction.

Referring now to my feed mechanism, there is provided a rigid framesustained upon corner posts 40 and comprised of side plates 41 and 42connected at spaced intervals of the length by cross-bars 43. This frameis so located as to have its longitudinal median line coincide with thatof the press, but a feature of considerable importance is that the twoframes, that of the feed mechanism and that of the press, are entirelyunattached, hence requiring no special fittings in order to adapt the,feed mechanism to use with practically any type of platen printingpress, the only connection between the press and the feed mechanismbeing a drive transfer correlating the operation of the feed mechanismthe press.

Located adjacent the rear end of the feed frameand receiving a journalmounting in bearings carried by the,

side plates, there is provided a transverse power shaft 44 projecting byits ends beyond the sides of the frame,

- and fast to one of these projecting ends is a sprocket with theoperation of wheel 45 continuously driven by a chain 46 off a sprocketwheel 47 fast to the drive shaft 32 of the press. A cam wheel 48 is alsocarried upon this same end of the shaft, and for a paper-cutting purposewhich will be later described operates through a bell-crank 48 toreciprocally operate a flexible cable 50, the bell-crank beingfulcrumed, as at 51, to the side plate 42. Fixed upon the other end ofthis power shaft 44 there is provided a crank wheel 52 having in itsouter face a diametrically extending slot 53 of T-shaped planconfiguration, and received for endwise sliding movement within thisslot is a nut 54 from which projects a crank-pin 55. A jack-screw 56works in the threads of the nut and is held against endwise movement bya fitting 57 bolted to the crank wheel. It will be apparent thatrotation of the jackscrew imparts radial shifting movement to the nutand hence governs the throw of the attached crank-pin 55. Thisadjustable crank-pin connects with a rod 49'and through arack-and-pinion connection S59 imparts reciprocal rocker movement to twodisks journaled for swivel action upon a frame-carried jack-spindle 63and functioning as the driving complements of a friction clutch.Detailed in Fig. 9, one of said driving disks, designated by 61, is madeintegral with the pinion 58. The other disk 62 is urged directivelytoward disk 61 by the yielding force of a spring 60, and frictionallycaught between said disks and serving as the driven element of theclutch is a sprocket wheel 64. A nut 65 threaded upon a hub prolongation66 of the clutch element 61 permits adjustment of the spring load.

A transfer chain 67 carries the reciprocal rocker movement of thesprocket wheel 64 rearwardly to the sprocket teeth of a ring 68 whichfits over and is secured, as by pins 70, to the driving element 71 of aunidirectional clutch such, for example, as a Hilliard clutch. Thedriven element 72 of such clutch is contained within the drivingelement, and-presents to the inner side an axial neck prolongation 73which takes a journal mounting in the side plate 41 of the feed frame. Abrake wheel 74 surrounds this neck prolongation between the frame andthe clutch proper and is suitably secured, as by a pin or pins 75, tothe inner or driven clutch element 72. A brake strap 76 carrying afriction shoe 77 is provided for this brake wheel and is of theself-wrapping character having its two ends connected with the arms of aweighted lever 79 fulcrumed, as at 78, to the side plate 41. As will beseen from an inspection of Figs. 1 and 8, the brake permits the drivenelement 72 of the Hilliard clutch to turn with the driving element 71only in a clockwise direction, acting to grab said driven element as thedriving element moves with the chain 67 through the return run of thelatters reciprocal cycle.

The paper-feeding drum for the machine occupies a position between theside plates of the frame co-axial to the Hilliard clutch and isfabricated from annular headers 80 and 81 surrounded by a cylindricalshell 82, with one of these headers being connected, as by pins 83, tothe driven element of the Hilliard clutch and the other header beingpinned to a bushing 84 which is journaled for rotation in theframe-plate 42.

As an overhead complement to the paper-feeding roll there is provided apressure roll 85 carried by a shaft 86 whose two ends are each journaledfor free rotation in saddle openings of a respective keeper 87, thesekeepers being each pivotally mounted in pillow bearings 88. Springs 89,adjustable for tension, bear upon the free ends of the keepers toyieldingly hold the pressure roll against the paper-feeding roll.Laterally removed beyond each end of the pressure roll and carried forsliding adjustment upon the shaft 86 there is also provided a respectivecircumferentially grooved collar 91, and the function of these collarsis to adjustably position two rings 92 which fit loosely upon thepaper-feeding roll and act as side-edge guides for the paper being fed.

Said bushing 84, the headers 80 and 81, and the driven member of theHilliard clutch are each center-bored, and extending through theseregistering center-bores is a shaft 93 having each of its two endsexposed. Upon that end of the shaft which projects beyond said sideplate 42 there is keyed a worm wheel 94, and upon the other end, andnamely that end which projects beyond the Hilliard clutch, there iskeyed a dentated wheel 95 which I will hereinafter term a stop-wheel.Within the circumference of this stop-wheel there is provided are-entrant notch, and fixedly socketed in such notch is a radiallyprojecting lug 96. A threaded hole is tapped in the lug and a screw 97is received for vernier adjustment in this hole, the screw being exposedbeyond the front face of the lug. The screw acts as one of twolimit-stops for a pin 98 which overhangs the rim of said wheel, said pinprojecting laterally from a radially projecting ear 99 made integralwith the driving clutch element 71. The other limit-stop is comprised ofa block 100 movable bodily into selected adjusted positions within thecircumference of the wheel. In the construction shown, this block fitsclosely within the throat of a yoke 101 straddling the stop-wheel andswingable about the center of shaft 93 as an axis, and presents upon itsinner face a series of transversely-cut teeth which find a matinginterfit with teeth 102 out in the perimeter of the wheel, the partsbeing firmly anchored by a thrust-screw 103 threading in the cross-armof the yoke. In order to release the block for moving the same from oneto another circumferentially adjusted position it is only necessary toback off the screw, whereupon the yoke can be swung free of the block inthat the back wall of the block and the inner wall of the yokescross-arm are each formed as arcs of a circle taken about the swing axisof the yoke.

Clarity in an understanding of the invention will perhaps be advanced byhere tracing the operation of the parts which have been so fardescribed. Let it be assumed, for the present purposes, that thestop-wheel 95 is a stationary wheel. The operator, having ascertainedthe de sired distance which he wishes to feed the paper in each of asuccession of repeating feed movements, locates the two limit-stops incorrespondence therewith, first obtaining a broad setting by bodilymoving the block 100 and obtaining a fine setting by adjusting theVernier screw 97. The operator then adjusts the throw of the crank pin55, setting the latter so as to transmit to the pinion 58 a degree ofarcuate travel somewhat in excess of that which, by'motion carriedthrough chain 67, will move the pin between the two limit-stops. Thesesettings, and namely the setting of the limit-stops and the setting ofthe crank-pin, are easily arrived at by providing suitable graduatedmarkings (not shown) for the concerned parts. Disregarding for themoment the course taken by the paper after passing over the bed-plate23, and assuming only that its leading end is caught between the feeddrum 82 and its pressure roll 85, it will be apparent that the crank pin55 takes its drive by chain 46 off the continuously driven power shaftof the press and is caused to rotate one complete revolution for eachrevolution of the gear wheel 30. In each such revolution the connectingrod 49 acts upon the pinion 59 to move the latter through a completecycle of reciprocation, and the pinion acts through its associatedfriction clutch to reciprocally drive the transfer chain andresponsively turn the driving member 71 of the Hilliard clutch. In theclockwise motion of this driving clutch element, the same couples itselfto the driven clutch element 72 and the two then turn in concert andcarry to the feed roll a like clockwise movement which acts to draw thepaper'fon wardly. The clockwise turning motion of the driving clutchelement will perforce be arrested when its projecting pin 98 strikes thelimit-stop 100. The slippage provided in the primary friction clutchallows the driving element 71 to be arrested and still permit the pinion59 to turn,

through a somewhat greater are of clockwise movement, As the crank pin55 passes dead-center the motion of the pinion 59 is reversed and thedriving element of the Hilliard clutch is then caused to responsivelyturn in counter-clockwise motion. During this return motion the brake 76grabs the driven element of the Hilliard clutch to hold the latterstationary. The driving element of the Hilliard clutch moves in saidreturn travel until it is arrested by contact with the limit-stop 97,and here again slippage within the primary clutch permits the pinion 59to partake of an over-riding travel. The printing action of the platenis timed to occur as the crank-pin works toward dead center at the rearextreme of its rotary travel, during which time the paper is perforcestationary. The structure which has been described is self-sufiicient toaccomplish an accurate feed if it can be assumed that paper beingprinted will be subject to substantially the same degree of stretch ineach of a succession of printing runs. However, by reason of changingtemperatures and humidities and other variable factors this is seldomthe case and in compensation of these variables I have engineered acorrective device into the machine. This device comprises aphoto-electric device which is or may be of the usual type providing alight source 105 and a photo-tube 196 so related one to another and tothe paper being fed as to energize the tube by cast light refiected offthe paper. The photo-electric device is contained in an electric circuitcontrolled by a switch 107 and includes a relay 108 (Fig. 14) leading toa repeating solenoid 110, the solenoid acting through ratcheting meanssuch as the indicated Hilliard clutch 111 to impart rotary movement to ashaft 112 on which is carried a worm 113 meshing the worm-wheel 94.

The movement given is such as to turn the wormwheel, and perforce thestop-wheel 95 which is directly connected therewith, in a clockwisedirection. Switch 107 is caused to be operated in timed concert with theoperation of the paper feed, and particularly in a manner whichcompletes a circuit to the photo-electric device simultaneously with ormomentarily after contact of the pin 98 with the limit-stop breaking thecircuit upon or shortly following the initiation of the pins return orcounter-clockwise motion. By this token the circuit could, if desired,be engineered so as to employ the pin 98 as a means of making andbreaking the same but this introduces objections from the standpoint ofsparking and I prefer to employ a star-wheel snapswitch in which thespokes 115 of the wheel are activated in quarter-turn motions by pins116 and 117 protruding from the inner face of the crank-wheel 52. Inthis arrangement the circuit is closed by the pin 116 and opened by thepin 117.

In order that the photo-electric device will perform its intendedfunction, it is only necessary that the opera-- tor impress upon thepaper, in the first printing run, some form of gauge mark which willabsorb light rays cast from the light source. pose will in many cases beinherently contained in the make-up of the first printing but can, ifnecessary, be added thereto. Designated by 118, I have shown in Fig. 14such a series of augmenting gauge marks, deleting for simplicity theaccompanying first run of printed matter which necessarily would havebeen impressed upon the paper web coincident with the impression ofthese gauge marks. During this first printing run the photoelectricdevice is inactivated by opening a master switch 120, thus dependingentirely upon the normal action of the main Hilliard clutch tointerruptedly advance the paper web. For the following over-printingditferent color run) the operator desirably cuts in the photo-electricdevice although, as before stated, he can obtain a fair approach toregistering accuracy without using this control. The significance of thephoto-electric eye is that it compensates for any stretch variationstaking place within the length of the web, a factor which must beconsidered if exact registering accuracy is to be obtained.

Marks which will serve the pur- 53 In the present machine, the functionperformed by the electric eye is to inch the stop-wheel forwardly andresponsively permit the pin 98 to creep in a corresponding degree duringthat momentary period of time in the cyclic movement of the primaryfriction clutch when clockwise slippage is taking place.

While not detailed in the drawing said photo-electric device shoulddesirably admit of being adjusted both transversely and longitudinallyas respects the major axis of the paper web in that the operator wouldbe otherwise precluded from using, as a gauge mark, impressed markingsinherently contained in various set-ups of type. With a machine whichadmits of moving the paper in each feeding cycle any desired distance upto a maximum of 22 /2 inches, and this is the range of feed adjustmentwhich I have engineered into the machine presently being produced, itbecomes necessary only that the photoelectric device be longitudinallyshiftable one-half this distance. The degree of transverse shift shouldcorrespond to the width of the paper web. It might appear from aninspection of Fig. 1 that the limited space available between the twoguide rolls 36 and 37 would preclude the device from being adjustedlongitudinally in the maximum degree desired, and with some types ofpresses this situation does exist. It becomes desirable,

shown in Figs. 15 through 19, inclusive, and it will be apparent from aninspection of these views that the matter of space limitations is thenno longer a problem. However, should an operator wish to retain hisexisting paper mount the photo-electric device can then besatisfactorily mounted upon the feed frame although it is desirable toposition the same in close proximity to the bed-plate of the press.

It will be noted that I have provided a separate manually-operatedcontrol knob 1121 connecting through miter gears 122l23 with theworm-shaft 112. Making compensation for error through use of this manualcontrol, and which is utilized only when the electric eye is inactive,is of course resorted to only when the minute error of feed taking placeduring each of a succession of printing cycles has become so magnifiedthrough compounding as to become visible to the naked eye.

It is a feature of not inconsiderable importance in the present machineto provide a means for drying the inked surface of the paper, and thisserves two distinct ends. One is the self-evident purpose of protectingthe printed matter against any tendency to smear as it is drawn underthe pressure roll, and the other is to minimize stretching andparticularly give to the paper, before reaching the ch the samecondition of dryness which obfeed roll, mu tains as it comes off thesupply roll. My dryer is' comprised of an endless belt 124 coated withsand, emery or other like grit body and passing about free-turningrollers 125 and 126. Dead axles carry these rollers and are themselvessupported by the side bars of a frame structure 127 extending rearwardlyfrom the feed frame and connected for vertical swinging adjustment tothe latter. The rollers are removably mounted in the frame, the ar- Theor outermost axle 130 are straight slots whereas the slots bear againstframe-carried lugs 134 for holding the axles in place and establishingadesired degree of tautnessof the belt is significant inin the belt. Thesand coating its ability to store heat concentrated upon the upper runof the belt by a heat lamp 135, the paper web working from the bed-plate23 along the lower run of the belt 129 for the frontaxle are broughttoand thence passing diagonally upwardly to a roller 136 from whence itextends forwardly to the feed drum.

The paper-cutting device which I have incorporated in the machineoccupies a position to the front of the feed drum. The device admits ofbeing activated or inactivated at will and is of course made to operateupon the paper following the last of a succession of printing runs. Suchcutting device can of Figs. 3, 5, and 6, and provides a cutting knife137 supported upon a carriage 138 for vertical reciprocatory movementinto and out of a position whereat the edge of the knife establishes apaper-shearing action across the edge of a complementing stationaryblade 140. A rockshaft 141 connects by rocker-arms 142 with the knifeand upon a projecting end carries a lever 143 which connects with theflexible cable 49, the cable acting to move the knife in its operatingdown-stroke of reciprocation against the yielding force of a returnspring 144. The cam is timed to operate upon the knife when the feeddrum is inactive. manually shiftable into longitudinally adjustedpositions by means of endless chains 146 one of whose supportingsprocket wheels, as 147, is controlled from a hand-knob 148 byintermeshed gears 1S0151.

In performing over-printing runs of the press it will be understood thatthe paper, as it feeds out from the feed drum in successive said runs,is wound upon a receiving reel (not shown), and it is the usual practiceto then rewind the paper upon the supply reel before commencing the nextrun, although the re-winding step can be eliminated by reversing thetype upon the platen.

In Figs. 15 through 19, inclusive, 1 have illustrated an advanced methodof feeding the roll of paper from the supply reel to the bed-plate ofthe press. A factor to be considered in connection with ing of paperfrom a roll is the force of inertia upon the roll, causing the latter tomore or less continually unwind and present slack paper between the rolland the platen. In. an effort to counter this condition it has beencommon practice to frictionally retard the rotation of the reel but thisplaces an unnecessary load upon the feed mechanism. My perfectedarrangement is designed to replace the more conventional structure shownin Fig. l and provides a framework presenting, at each side, a standard153 and a rearwardly projecting bar 154, and cut in each said bar is alongitudinal slot 155 slidably accommodating a traveller 156. A tie-rod157 presenting a laterally projecting end 158 extends transversely fromone to the other said traveller, and journaled upon this rod for freerotation between the side-bars 154 is a roller 160. To yieldingly urgethe rollers in a rearward direction, a cable 161 is tied to eachtraveller and extends rearwardly therefrom to take one or more wrapsabout a respective one of two grooved wheels 162 tensioned by a torsionspring 163.

The roll of paper is caught between cone-shaped clamping collars 164fixed by set-screws 16S upon a spindle 166. One end of this spindle fitsin an open journal 167 provided by one of the two standards 153.Journaled in the other standard for rotation about a coinciding axis isa block 170 having a squared center-bore, and a squared tip 171presented by the spindle fits in a portion of this bore. A brake-wheel172 also finds a journal mounting in the last-named standard andsimilarly presents a squared center-bore to admit of being coupled tothe block by means such as the indicated key-slug 173. A locking screw174 passes through a center-bore of the key-slug and takes a threadpurchase in the spindle. The brake wheel is complemented by abrake-strap 175 having one end anchored, as at 176, to the relatedstandard and connecting by its other end to the short arm 177 of abrake-setting lever, this lever being fulcrumed, as at 178, to thestandard and locating its long arm 179 in an interruptive position inthe spring-urged travel path of said projecting end 158 of thetraveller-rod 157. In the be best seen from an inspection The carriageworks in slide-ways 145 and is the intermittent feednormal operation ofthe paper-feed mechanism, the roller 160 partakes of a more or lesscontinual reciprocal movement, taking up and paying out that which wouldnormally be slack paper. Should the inertia of the supply 0 spool causethe paper to run off the spool in excess of the compensating travel ofthe roller 160, the resulting unrestrained rearward travel of the rollerbrings pin 158 against the levers long arm 179 and responsively sets thebrake, the spool being then arrested until the roller 160 is again drawnforwardly against the comparatively minor restraint of the torsionspring 163.

Although I have here illustrated and described in detail the nowpreferred embodiment of the invention, it is evident that changes can beresorted to without departing from the spirit of the invention and Iaccordingly intend that no limitations be implied and that the heretoannexed claims be given a scope fully commensurate with the broadestinterpretation to which the employed language admits.

What I claim is:

l. The combination of a member admitting to movement along a giventravel path, a stop normally occupying a localized position within saidtravel path and performing an interrupting function upon said member,drive means frictionally engaging the member to move the latter at acomparatively rapid rate of speed along said travel path and admittingto an overriding slippage when progress of the member is interrupted bycontact With the stop, and means imparting to the stop a slowspeedadvance motion and made to operate upon the stop after said contact ismade so as to then inch the stop forwardly and thus allow the member tocreep with the stop at a comparatively low rate of speed.

2. In a web-feeding mechanism, a normally stationary stop-wheel, aweb-feeding drum and a driving wheel both of which are journaled forturning motion about an axis coinciding with the center of thestop-wheel, a unidirectional clutch establishing a driving connectionfrom the driving wheel to the drum, a pair of stops car- 10 ried by thestop-wheel with one of said stops being fixed and the othercircumferentially adjustable within the perimeter of the wheel, meanscarried by the driving wheel and by oppositely directed turningmovements of the latter brought into engagement with the stops toprescribe end limits of the power wheels permissible motion relative tothe stop-wheel, power-driven means acting to reciprocally move saidpower wheel within said prescribed limits while being itself permittedto partake of an overriding travel, the setting of such stops being suchthat the turning motion transferred by the unidirectional clutch to thedrum as the driving wheel moves between said stops advances the webthrough a major degree of travel less than a predetermined requireddistance, and governed means made functional upon said stop-wheel as afollow-up to the recited web'fceding action for imparting a slightturning movement to the stop-wheel and by such movement responsivelyallowing the driving wheel to creep forwardly in the minor degreenecessary to further advance the web the remaining distance of itsrequired travel.

3. In a web-feeding mechanism, a normally stationary stop-wheel, aweb-feeding drum and a driving wheel both of which are journaled forturning motion about an axis coinciding with the center of thestop-wheel, a unidirectional clutch establishing a driving connectionfrom the driving wheel to the drum, a pair of stops carried by thestop-wheel with one of said stops being fixed and the othercircumferentially adjustable within the perimeter of the wheel, meanscarried by the driving wheel and by oppositely directed turningmovements of the latter brought into engagement with the stops toprescribe end limits of the power wheels permissible motion relative tothe stop-wheel, power-driven means acting to reciprocally move saidpower wheel within said prescribed limits while being itself permittedto partake of an overriding travel, the setting of such stops being suchthat the turning motion transferred by the unidirectional clutch to thedrum as the driving wheel moves between said stops advances the webthrough a major degree of travel less than a predetermined requireddistance, and means governed by equidistantly spaced markings occurringupon the Web which is being fed and made functional upon said stop-wheelas a follow-up to the recited web-feeding action for imparting a slightturning movement to the stop-Wheel and by such movement responsivelyallowing the driving wheel to creep forwardly in the minor degreenecessary to further advance the web the remaining distance of itsrequired travel.

4. In Web-feeding mechanism, a normally stationary shaft, a web-feedingdrum and a driving wheel both of which are traversed by the shaft andjournaled for turning motion about the center of the shaft as an axis, aclutch establishing a driving connection from the driving Wheel to thedrum in one direction only of the driving wheels turning movement, astop-wheel positioned side the driving wheel and fixed to an end of theshaft, a pair of stops carried by the stop-Wheel with one of said stopsbeing fixed and the other circumferentially adjustable within theperimeter of the Wheel, means carried by the driving wheel and byoppositely directed turning movements of the latter brought intoengagement with the stops to prescribe end limits of the power wheel'spermissible motion relative to the stop-wheel, powerdriven means actingto reciprocally move said power wheel within said prescribed limitsWhile being itself permitted to partake of an overriding travel, thesetting of such stops being such that the turning motion transferred bythe unidirectional clutch to the drum as the driving wheel moves betweensaid stops advances the web through a major degree of travel less than apredetermined required distance, and governed means connecting with theend of the shaft opposite to said stopwheel to operate as a follow-up tothe major advance of the Web and acting through said shaft to impart aslight turning movement to the stop-Wheel and by such movementresponsively allowing the driving wheel to creep forwardly in the minordegree necessary to further advance the web the remaining distance ofits required travel.

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